Radio apparatus



Oct. 24, 1933.

J. A. BRICKER El AL 1,932,171

RADIO APPARATUS Filed Sept. 1, 1928 Condenser A05- -B* DET B+AMP art wanton Ja/zn A. Bria/Yer a N 3351, MZliai/z Hfliua/ier WM 6mm,

Patented Oct. 24, 1933 RADIO APPARATUS I John A. Bricker and William H. Stucker, Canton, Ohio Application September 1, 1928. Serial No. 303,470

3 Claims. (01. 250-40) Our invention relates to radio apparatus, and more particularly to radio receivers adapted for operation ,over a wide range of wave lengths or frequencies.

The various radio sending stations of the world impress waves into the ether which have wave lengths varying from 5 to 8,000 or more meters, or, in other words, frequencies varying from 60,000 to 37.5 or less kilocycles.

1Q Certain bands of waves are reserved by international and national law or agreement for certain classes of service, and a radio receiver adapted, for example, for receiving programs broadcast on the so-called high wave lengths, is not 5 adapted for receiving programs broadcast on the so-called low wave lengths, or for receiving code messages and the like sent on still other wave lengths.

The number of program broadcasting stations has become so large that many stations are being allocated with wave lengths outside of the range of the commercial radio receivers heretofore marketed and now in use.

In order to extend the range of stations pos- 5 sible to be received by a given radio receiver, it

has been proposed to provide a number of different coils each adapted for being selectively connected in the circuit. Changing coils in this way disturbs the capacity of the circuit in an undesirable manner. Moreover, there is a likelihood "of the coils not in use becoming lost or damaged.

Accordingly, one object of the present improvements includes the provision of interchangeable elements, preferably variable condensers, which H are all always in use in a radio circuit, and which may be easily and quickly substituted one for the other in different locations in the circuit, for varying the characteristics thereof, so that with one arrangement of the interchangeable ele- 4 ments, a certain band of waves may be received,

and with another arrangement of the interchangeable elements, another band of waves may be received.

Another object of the invention includes the provision of an improved plug-in variable condenser particularly adapted for interchangeable use, as aforesaid.

These and ancillary objects are attained in the present invention, as will be exemplified hereinafter in detail, and claimed.

A preferred embodiment of the invention is illustrated in the accompanying drawing forming part hereof, in which Figure 1 is a diagrammatic view illustrating the improved radio apparatus hereof, in the form of a receiving circuit, including the improved interchangeable elements comprising variable condensers; I

Fig. 2, a side elevation with portions in section, of a preferred form of the improved interchangeable element, comprising a plug-in variable condenser of novelconstruction; and

Fig. 3, an end elevation thereof; Similar numerals refer to throughout the several views.

The receiving circuit 10 indicated diagrammatically in Fig. 1 is one embodiment of a regenerative circuit which'includes a tuning condenser and a condenser for the feed back circuit.

1 If the tuning condenser has a small capacity of .0001 mrnf., for example, the circuit will receive the higher frequencies or shorter wave lengths, and if the tuning condenser has a large capacity, of .0005 mmf., for example, the circuit will receive the lower frequencies that is to say the longer wave lengths.

On the other hand it has been found that the feed back condenser may be of high capacity when the tuning condenser is of small capacity, and vice versa.

Accordingly the present invention includes the provision of a radio circuit 10 including a plurality of variable condensers 11 and 11' each having a diiferent capacity, and each being arsimilar parts ranged for interchangeable use in a plurality of locations in the circuit. 1

For providing for this interchangeability of use each condenser is mounted on a sub base 12, which is provided with a plurality of contacts 13 and 13 to which the condenser terminals 14 and 14 are connected by suitable conductors 15 and 15', respectively.

The condenser contacts 13 and 13 are preferably in the form of plug-in connector pins arranged to be removably inserted in suitable contact sockets l6 and 16' mounted on the set panel 17.

The condenser operating shaft 18 may be connected by a coupling 19 with one or more of the other condensers in the set, in the actual construction and arrangement thereof.

Accordingly with one arrangement of the condensers, one band of frequencies may be received by the set and when the condensers are interchanged, another band of frequencies may be received, thereby avoiding the necessity of carrying extra condensers or coils or of having one radio receiving set for high frequency operation and another set for low frequency operation.

We claim:-

1. A selective circuit including a plurality of electrically associated elements, some of the elements including a plurality of conductors, a plurality of sets of contact members connected with the conductors, and a plurality of condensers equal to the plurality of sets of circuit conductor contacts, each condenser having terminals and a set of contacts connected with the terminals, each condenser and its set of contacts being bodily movable and interchangeable from one set of the circuit conductor contacts to another, and each set or condenser contacts being adapted for removable electrical connection with each set of circuit conductor contacts, all of the condensers having their contacts connected with the circuit,

conductor contacts for enabling the circuit to pass a band of wave frequencies, and one arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass one band of wave frequencies and another arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass another band oi wave frequencies.

2. A selective circuit including a plurality of electrically associated elements, some of the elements including a plurality of conductors, a plurality of sets of contact members connected with the conductors, and a plurality of variable condensers equal to the plurality of sets of circuit conductor contacts, each condenser having terminals and a set of contacts connected with the terminals, each condenser and its set of contacts being bodily movable and interchangeable from one set of the circuit conductor contacts to other, and each set of condenser contacts being atlapted for removable electrical connection with each set of circuit conductor contacts, all of the condensers having their contacts connected with the circuit conductor contacts for enabling the circuit to pass a band of wave frequencies, and one arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass one band of wave frequencies and another arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass another band of wave frequencies.

3. A selective circuit including a plurality of electrically associated elements, some of the elements including a plurality of conductors, a plurality of sets of contact members connected with the conductors, and a plurality of condensers each having different capacities equal to the plurality of sets of circuit conductor contacts, each condenser having terminals and a set of contacts connected with the terminals, each condenser and its set of contacts being bodily mov able and interchangeable from one set of the circuit conductor contacts to another, and each set of condenser contacts being adapted for removable electrical connection with each set of circuit conductor contacts, all of the condensers having their contacts connected with the circuit conductor contacts for enabling the circuit to pass a band of wave frequencies, and one arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass one band of wave frequencies and another arrangement of all the condensers electrically connected in the circuit enabling the circuit to pass another band of wave frequencies.

JOHN A. BRICKER.

WILLIAM H. STUCKER. 

